Composability of `difflib`

Feature or enhancement

Proposal:

I closed https://github.com/python/cpython/issues/144132 in favour to more gradual divide and conquer approach.

And this is the first part, which I think is the most valuable one.
It enables user to implement his own Matcher and Differ types to do all the nice things that difflib enables.

Given the current state of affairs, I don't think there were many ways to do it.
And in terms of nature of arguments provided to different functions, I only saw one.

Very much open to any suggestions / concerns.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/algorithmic-complexity-of-difflib/105844/98

Linked PRs

• gh-145210

首先审阅链接的 PR gh-145210 以及 issue 中引用的 Discourse 讨论，然后检查 Python 的 difflib 实现和公共 API。当所提议的可组合性方案形成确定的设计，并且链接的贡献或由此产生的更改解决了该提案时，这项工作即告完成。